Bird feeder



FIG. 1 is a side elevational view of a bird feeder showing our new design;

FIG. 2 is another side elevational view thereof, taken 120 degrees to the right of FIG. 1;

FIG. 3 is a third side elevational view thereof, taken 120 degrees to the left of FIG. 1;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a bird feeder, as shown and described. 